<template>
 <li 
  :class="isActive ? 'active' : ''"
    @mouseenter="changeItemHandle('enter')"
    @mouseleave="changeItemHandle('leave')"
 >
    <label>
      <input type="checkbox" :checked="done" @click="asignChange(id)"/>
      <span>{{ thing }}</span>
    </label>
    <button class="btn btn-danger" @click="asignDelete(id)">删除</button>
  </li>
</template>

<script>
import { mapMutations } from 'vuex';
export default {
  name: "Item",
  props: ["id" , "thing" , "done"],
  data(){
    return{
      isActive: false
    }
  },

  methods:{
    //鼠标移入移出事件
    changeItemHandle(type) {
      this.isActive = type === "enter";
    },

    //映射单个切换函数
    ...mapMutations(["asignChange" , "asignDelete"])
  }


};
</script>

<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}



li.active {
  background: #ccc;
}

li.active button {
  display: block;
}
</style>